Nrthugu

I am trying to create SQLite database via android 3.1. But it doesn't work as code following below. Please kindly help thanks.

Main Activity.class

public class MainActivity extends AppCompatActivity { DatabaseHelper myDb; 



    @Override

    protected void onCreate(Bundle savedInstanceState) {

        super.onCreate(savedInstanceState);

        setContentView(R.layout.activity_main);

        myDb = new DatabaseHelper(this);  // this is contact, this is new extension of DatabaseHelper



    } 

} 

DatabaseHelper.class

public class DatabaseHelper extends SQLiteOpenHelper { 

    public static final String DATABASE_NAME = "Iters.db";

    public static final String TABLE_NAME = "iters_table"; //called onCreate method

    public static final String COL_1 = "ID";

    public static final String COL_2 = "NAME";

    public static final String COL_3 = "SURNAME";

    public static final String COL_4 = "MARKS";





    public DatabaseHelper(Context context) {



        super(context, DATABASE_NAME, null, 1);

        SQLiteDatabase db = this.getWritableDatabase(); 

    }



    @Override



    public void onCreate(SQLiteDatabase db) {



        db.execSQL("CREATE TABLE TABLE_NAME (ID INTEGER PRIMARY KEY AUTOINCREMENT," +

                "NAME TEXT," +

                "SURNAME TEXT," +

                "MARKS INTEGER)");



    }



    @Override

    public void onUpgrade(SQLiteDatabase db, int i, int i1) {

        db.execSQL("DROP TABLE IF EXISTS " +TABLE_NAME);

        onCreate(db);

    } 

 }

It would appear that your issue is probably that you are naming the table TABLE_NAME rather than iters_table.

You could correct this by using :-

db.execSQL("CREATE TABLE " + TABLE_NAME + "(ID INTEGER PRIMARY KEY," +

                "NAME TEXT," +

                "SURNAME TEXT," +

                "MARKS INTEGER)");

• 
  Note I've also removed the AUTOINCREMENT keyword as you very likely don't need it (the ID column will still be auto-generated 1, then 2 then 3 etc (probably)) as :-
  
  
  
  
  • a) It's perhaps most mis-used keyword, and
  
  
  • b) It's a bit costly in terms of performance
  
  
  • You may wish to have a read of SQLite Autoincrement, considering that the the first sentence is The AUTOINCREMENT keyword imposes extra CPU, memory, disk space, and disk I/O overhead and should be avoided if not strictly needed. It is usually not needed. I believe that the overhead is a loss of performance to the tune of between 8% and 12% (as per What are the overheads of using AUTOINCREMENT for SQLite on Android?
    )